The Polish-Lithuanian Commonwealth 1466 - 1667

Map of the Polish Lithuanian Commonwealth and Kingdom of Poland, Grand Duchy of Lithuania, Ruthenia, Duchy of Prussia
In 1569, the Lublin Union united Poland and Lithuania as the Polish-Lithuanian Commonwealth. The Polish-Lithuanian Commonwealth installed an "interstate federal union based on common institution" (Lerski 622). This meant that kings were elected jointly, but the legal systems and administrations remained separate. The states acted as a single entity in external affairs.
Poland History

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